/ ˌʌnɪnˈtelɪdʒəbl; NAmE / adjective
unintelligible (to sb) impossible to understand
SYN incomprehensible :
She turned away and muttered something unintelligible.
A lot of the jargon they use is unintelligible to outsiders.
OPP intelligible
► un·in·tel·li·gib·ly / -əbli; NAmE / adverb